Alas for the “Supernatural” spinoiff, there aren’t many details available yet. That would be because the development of any new series remains in the earliest stages. The spinoff will first appear as an episode implanted into Season 9 of “Supernatural” and will continue the parent series’ focus on the fight between hunters versus demons, monsters and the like.
Unlike the constantly traveling “Supernatural,” this spinoff will have a very set location: Chicago. There will be one other big change between the original and the spinoff as well — none of the actors known from “Supernatural” are expected to appear regularly in the new series. “I don’t think anyone’s planning to have continuing characters” Pedowitz explained when asked about who might carry over.
There is obviously a chance that the Winchesters or Castiel might show up at any point, but whoever the regulars of this spinoff might be, they will be new.